*{
    margin: 0;
    padding: 0;
    text-decoration: none;
    font-family: "微软雅黑";
    box-sizing: border-box;
    list-style: none;
}
.header{
    width: 100%;
    height: 48px;
    background-color: #FF3333;
    text-align: center;
    line-height: 48px;
    font-size: 18px;
    color: #FFFFFF;
    position: relative;
    span{
        display: block;
        width: 17px;
        height: 30px;
        background-image: url(../img/return.png);
        background-size: 100% 100%;
        position: absolute;
        top: 9px;
        left: 10px;
    }
}